Throttle-valve.



No. 701,679. Patented :une 3, |902.

J. S. CHAMBERS. Y THnoTTLE VALVE.

(Application l'ed June 1, 1901.)

(No Model.)

me NoRms PETERS co., Pnorwmmo., wAsHmaoN. b, r..

' UITEn STATES.'

PATENT OFFICE.

JOHN S. CHAMBERS, OF ELZABETH, NEW' JERSEY.

TH ROTTLE-VALVKE.

SPECIFICATION forming part of Lettersl Patent No. 701,679, dated J une 3, 190,2. Application filed June 1, 1901. Serial No. 62,681. (No model.)

T0 all' whom it muy concern: l y Be it known that I, JOHN S. CHAM-BE-Rs,"a citizen of the United States, and a-resident of Elizabeth, in the county of Union and Stateof New Jersey,have invented affnew 'and'u'seful Throttle Valve, of'fwhich the following'isa specification. t

My invention relates to a throttle-valve,with theobject in view of providing a valve'so constructed that it will take steam through the top to a considerable extent before it takes steam through the bottom and will require the steam in any event to pass over the top of the valve-casing before passing through the valve, thereby materially reducing the liability of the passing of water through the valve to the cylinder.

A practical embodiment of my invention is represented in the accompanying drawings, in which- Figure 1 represents the valve and its casing in vertical section, the cup for balancing the valve being made removable from the valvecasing Without interfering with thepractical operation of the valve; and -Fig.-2 showsin4 vertical section the valve and its casing, the

cups for balancing thevalve forming a clo-` sure for the valve-casing at the bottom;

The valve-casing is denoted by'a and is' provided with a Valve-seat b atits top'and with a valve-seat o at its bottomv In'the 'I form represented in Fig. 1 the casing ay con-v tinues below the valve-seat c, forming a elo-- sure beneath the seat, save only the central opening for the reception ofthe valve-operating lock d.

The valve-seat b is larger than the valveseat c and is opened and closed by avalve e, having a depending tubular extension f, the linterior of which has a diameter preferably equal to or` slightlygreater than the diameter of the lower or smaller valveseat c.

The valve e is-connected with the valve-rod d through the hub g of its skeleton top, the lower end of the hub'g resting on a Washer h, abutting a shoulder 'L' Von the valve-rod, and the upper end of the hub g engaged bya nut j, screwed onto the top of the valve-box.

The valve which seats on the lower seat c is denoted by 7c and is extended in tubular form upwardly within the downwardly-extended tubular extension fof the valve e and has a close sliding fit within it.

The valve 7c is attached to the valve-rod d,

the latter passing through the hubZ of its vskeleton head. -.A nut rfm, screwed on the -'valve-"rod "d,"eng`ages the upper end of the h'ub'Z, while the lower end is engaged by a Washer n on the valve-rod and abutting against a shouldero. Thereis a space left betweenV the upper face of the washer n and the lower en djof'the hub l, so that the valve-rod d'may work freely upwardly through the hub l without lifting the valve k from its seat until the valve e shall have been opened a distance equal to the space between the lower end of the hub Z and the washer n.

To the bottom of the valve-casing an annular cup p is removably secured, in the present instance by means of screws q. The valverod d passes through a central hub r in the cup p, and an annular piston s works with a close sliding fit Within the cup p, thelsaid piston s having its shank t secured to the valverod d, between a collar u on the Valve-rod, engaging the lower end of its shank, and a nut o, screwed on the valve-rod and engaging the vupper end of the shank.- 4A passage-way w leads from the low-pressure side of the valvecasing to the bottom of the annular cup 19,

within which the balancing-piston s operates. When the balancing-piston s is employed,

'the throttle-valve will be nearly counterbal- `anced, the pressure upon the valve being sufflciently greater than that upon the balancing-piston to insure its being held to its seat.

When it is desired to admit steam through the throttle, the upward movement of the valve-rod d will open the valve e and will admit steam between it and its valve-seat b, while the valve 7o remains closed until the rod d shall have been lifted sufficiently to bring the washer n intoy contact withthe lower end of the hub Z of the valve k. It is intended that this lifting of the valve e independently of the valve 7c shall be sufficient to supply the necessary amount of steam for ordinary purposes, the further lifting of the rod, and the consequent opening of the lower valve k, being resorted to when an unusual steam-supply is demanded. This insures the passage of the drier steam only through the valve,

the wetter steam being lower down in the valve-chest. Furthermore, the structure is such that when the lower valve is open it will still require the steam to pass over the top of the valve-casing before it can escape past the valve 7c, between it and its seat c. Again, in the event it should be found desirable to do away with the balancing of the valve the annular cup p might be removed and the valve would still be operative for practical purposes.

In the form shown in Fig. 2 the operation is quite similar to that hereinabove described in respect to the form shown in Fig. l. The essential diierence lies in making the annular cup p', in which the balancing-piston s operates, form the bottom of the valve-casing beneath the lower valve la. The annular cup is in this instance conveniently provided with a screw-threaded extension cc, which enters a screw-threaded socket y in the base of the valve-casing.

The upper and lower valves e and 7c hereinabove referred to form sections of the complete throttle-valve, and the extent of the movement of the one section e independently of the section k may be varied by adjusting the washer and nuts upon the valve-rod d to suit the requirements.

The structure is a simple and effective one for the purposes in hand, both valve-sections being free to rotate on the valve-rod d to compensate for wear.

What I claim isl. A throttle-valve comprising a valve-casing provided with upper and lower valveseats, upper and lower valve-sections fitted to said seats and provided with tubular extensions, the tubular extension on the lower Valve boing arranged to telescope within the tubular extension on the upper valve-section, a valve-rod for operating the sections, the said sections having a rotary engagement with the rod and the upper valve-section being connected to the rod Ito move with it independently of the lower valve-section, the passageway of steam past the lower valve-section leading from a point above the upper valveseat, substantially as set forth.

2. A throttle-valve comprisinga valve-casing provided with upper and lower valveseats, an upper valve-section and a lower valve-section fitted to said seats, avalve-rod for operating the valve-sections, the said rod having a connection with the upper valve-section to operate it independently of the lower valve-section, an annular cup below the lower Valve-seat and in communication with the interior of the valve-casing and a counterbalance-piston connected with the valve-rod and adapted to work in said annular cup, substantially as set forth.

3. A throttle-valve comprising a valve-cas ing provided with upper and lower valveseats, upper and lower valve-sections tted to said seats, a valve-rod connected with said valve-sections for operating them, an annular cup removably attached to the bottom of the valve-casing and a counterbalance-piston connected with the valve-rod and arranged to work in said cup, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my namein presence of two witnesses, this 17th day of May, 1901.

JOHN S. CHAMBERS.

Witnesses:

FREDK. HAYNES, HENRY THIEME. 

